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This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today.
Warm-Season Flows on Slope in Horowitz Crater (Eight-Image Sequence)
This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today.
Dark Flows in Newton Crater Extending During Summer (Six-Image Sequence)
This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today.
Warm-Season Flows on Slope in Newton Crater (Five-Image Sequence)
This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today.
Warm-Season Flows on Slope in Newton Crater (Six-Image Sequence)
This image shows warm-season flows on a north-facing slope in middle southern latitudes of Mars.
Site of Warm Season Flows in Mars Crater
This image contrasts gullies and recurring warm-season slope flows appearing in the same crater, in the middle southern latitudes of Mars.
Gullies and Newly Identified Flow Features in Same Mars Crater
This image contrasts gullies and recurring warm-season slope flows appearing in the same crater, in the middle southern latitudes of Mars.
Gullies and Newly Identified Flow Features in Same Mars Crater (Arrows)
An image combining orbital imagery with 3-D modeling shows flows that appear in spring and summer on a slope inside Mars' Newton crater.
Oblique View of Warm Season Flows in Newton Crater
Unfrozen brine in cryopegs and fracture networks provides habitats for the survival and growth of organisms both within and under frozen rocky materials on Earth and, by analogy, could provide habitats on Mars.
Plausible Martian Habitats
This map of Mars shows relative locations of three types of findings related to salt or frozen water, plus a new type of finding that may be related to both salt and water.
Ice, Salt and Warm-Season Flows on Mars
The Mars Color Imager (MARCI), shown here with a gloved hand for scale, is designed to produce a global map to help characterize daily, seasonal and year-to-year variations in Mars' climate, providing a daily weather report for Mars.
Mars Color Imager (MARCI) for Mars Reconnaissance Orbiter
Planum Australe Region
Planum Australe Region
Crater in Thaumasia Fossae
Crater in Thaumasia Fossae
These images from orbit show an area near Mars' south pole where coalescing or elongated pits are interpreted as signs that an underlying deposit of frozen carbon dioxide, or "dry ice," has been shrinking by sublimation.
Pitting from Sublimation of Underlying Dry-Ice Layer
A newly found, buried deposit of frozen carbon dioxide -- dry ice -- near the south pole of Mars contains about 30 times more carbon dioxide than previously estimated to be frozen near the pole.
Thickness Map of Buried Carbon-Dioxide Deposit
This cross-section view of underground layers near Mars' south pole is a radargram based on data from the Shallow Subsurface Radar (SHARAD) instrument on NASA's Mars Reconnaissance Orbiter
Cross Section of Buried Carbon-Dioxide Ice on Mars
Images like this from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter show portions of the Martian surface in unprecedented detail. 
True Gullies on Mars
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this color image on March 9, 2011, of &quot;Santa Maria&quot; crater, showing NASA's Mars Exploration Rover Opportunity perched on the southeast rim.
Opportunity Is Still Smiling
This image shows the context for orbital observations of exposed rocks that had been buried an estimated 5 kilometers (3 miles) deep on Mars.
Nature's Drilling Exposes Deeply Buried Minerals
This image from orbit covers an area about 460 meters (about 1,500 feet) across, in which carbonate minerals have been identified from spectrometer observations. Fractures and possible layers are visible in the light-toned rock exposure containing the carbonates.
Fractures in Carbonate-Bearing Rocks at Mars' Huygens Basin
This picture of a heart-shaped feature in Arabia Terra on Mars was taken on May 23, 2010, by the Context Camera (CTX) on NASA's Mars Reconnaissance Orbiter.
Heart-shaped Feature in Arabia Terra (Wide View)
This picture of a heart-shaped feature in Arabia Terra on Mars was taken on May 23, 2010, by the Context Camera (CTX) on NASA's Mars Reconnaissance Orbiter.
Heart-shaped Feature in Arabia Terra
Three images of the same location taken at different times on Mars show seasonal activity causing sand avalanches and ripple changes on a Martian dune.
Seasonal Changes in Northern Mars Dune Field
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this image of the Opportunity rover on the southwest rim of "Santa Maria" crater on New Year's Eve 2010, or Martian day (sol) 2466 of the rover's work on Mars.
Mars Orbiter Sees Rover Opportunity at Crater Edge (Annotated)
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter acquired this image of the Opportunity rover on the southwest rim of "Santa Maria" crater on New Year's Eve 2010, or Martian day (sol) 2466 of the rover's work on Mars.
Mars Orbiter Sees Rover Opportunity at Crater Edge
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